title: Quantitative T*2-mapping based on multi-slice multiple gradient echo flash imaging: retrospective correction for subject motion effects.
abstract: Numerous clinical and research applications for quantitative mapping of the effective transverse relaxation time T*(2) have been described. Subject motion can severely deteriorate the quality and accuracy of results. A correction method for T*(2) maps acquired with multi-slice multiple gradient echo FLASH imaging is presented, based on acquisition repetition with reduced spatial resolution (and consequently reduced acquisition time) and weighted averaging of both data sets, choosing weighting factors individually for each k-space line to reduce the influence of motion. In detail, the procedure is based on the fact that motion artifacts reduce the correlation between acquired and exponentially fitted data. A target data set is constructed in image space, choosing the data yielding best correlation from the two acquired data sets. The k-space representation of the target is subsequently approximated as linear combination of original raw data, yielding the required weighting factors. As this method only requires a single acquisition repetition with reduced spatial resolution, it can be employed on any clinical system offering a suitable sequence with export of modulus and phase images. Experimental results show that the method works well for sparse motion, but fails for strong motion affecting the same k-space lines in both acquisitions.
authors.affiliation: Brain Imaging Center, Goethe University Frankfurt am Main, Frankfurt am Main, Germany. magerkurth@physik.uni-frankfurt.de
authors.forename: Joerg
authors.initials: J
authors.lastname: Magerkurth
authors.forename: Steffen
authors.initials: S
authors.lastname: Volz
authors.forename: Marlies
authors.initials: M
authors.lastname: Wagner
authors.forename: Alina
authors.initials: A
authors.lastname: Jurcoane
authors.forename: Sandra
authors.initials: S
authors.lastname: Anti
authors.forename: Alexander
authors.initials: A
authors.lastname: Seiler
authors.forename: Elke
authors.initials: E
authors.lastname: Hattingen
authors.forename: Ralf
authors.initials: R
authors.lastname: Deichmann
mesh_terms: D000328:Adult; D000465:Algorithms; D016477:Artifacts; D016893:Carotid Stenosis / Q000175:diagnosis; D002539:Cerebral Arterial Diseases / Q000175:diagnosis; D017352:Echo-Planar Imaging; D005260:Female; D019416:Head Movements; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D020768:Middle Cerebral Artery; D009038:Motion